Frank Langella, who was unforgettable as Richard Nixon a few years ago in “Frost/Nixon,” will return to Broadway next season in “Man and Boy,” Terence Rattigan’s long-forgotten but all-too-topical play about a corrupt financier.

Langella took part in a staged reading last week for the Roundabout Theatre Company, which aims to open the play at the American Airlines Theatre in the fall.

Langella played the financier, Gregor Antonescu, whom Rattigan called “as evil as Iago,” to a fare-thee-well, relishing the villainy but also striking a poignant note at the end as Antonescu’s frauds are revealed and his relationship with his son unravels.

Making the 1963 play topical is, of course, the Bernard Madoff scandal and the suicide of Madoff’s son, Mark.

Rattigan based “Man and Boy” on the Bernie Madoff of the early 20th century — Ivar Kreuger, a Swedish tycoon who hobnobbed with celebrities and politicians, including Douglas Fairbanks, Mary Pickford and Franklin Roosevelt.

Kreuger built a vast financial empire in the 1920s, which turned out to be a giant Ponzi scheme. He and many of his investors were ruined when the stock market crashed in 1929. He shot and killed himself in 1932.

In “Man and Boy,” the corrupt financier has a troubled relationship with his son, a musician who rebels against his father’s greed by becoming a socialist. Rattigan gave the story a homosexual twist. Desperate, the financier tries to lure a rich gay banker to prop up his teetering enterprise.

The original production was a flop in both London and New York. Critics called it “false,” “hollow” and “dull.”

The play was pretty much forgotten until Maria Aitken, who staged the Roundabout’s long-running hit “The 39 Steps,” came across the script in a London library in 2003. Michael Darlow, Rattigan’s biographer, called her attention to several earlier drafts, which she cobbled together for a tighter, sharper script.

She directed “Man and Boy” in the West End in 2005 with David Suchet in the lead. Critics raved about his performance, and there was talk about doing the production on Broadway, but Suchet had doubts about the play, and passed.

People who saw the reading at the Roundabout last week say “Man and Boy” isn’t perfect. But the role of the corrupt financier is so juicy — and Langella’s performance so theatrical — that it’s well worth doing.

“Man and Boy” will be the first in a parade of Rattigan plays headed to Broadway from London next season.

Stuart Thompson, one of the producers of “The Book of Mormon,” has the rights to “After the Dance,” a fine play about a group of hard-drinking, upper-class London swells whose cocktail parties are about to be broken up by World War II.

“After the Dance” was revived by the National Theatre last year with Benedict Cumberbatch (“Sherlock”) in the lead. He’ll tackle the role on Broadway later this year.

A revival of “Flare Path,” which is set in a hotel where RAF pilots gather before making bombing runs in Germany, just opened to glowing reviews in the West End. Directed by Trevor Nunn, the production stars Sienna Miller as a pilot’s wife.

New York producers are swarming all over Miller and the production.

Last but not least in the rediscovered Rattigan canon is “Cause Celebre,” a play about a woman who conspires with her teenage lover to kill her husband. The Old Vic just produced a gripping revival. Kevin Spacey, who runs the Old Vic, is in discussions with New York producers about a Broadway production.